Casinos want a credit card and a name and dress and photo id potentially. Do betting shops make you fill something in to collect your winnings?
U-Kash on the other hand can connect my AW account to a throw away email address connected to a punting phone. Anything more than that and I'd have to be an enemy of the state or under criminal investigation, but it's more than enough to hide my habit from credit records, the odd WG who loses it and future girlfriends and/or wives.
95% are cash transactions. Betting by debit card gives trackability.
Entering their in-house competitions offers up identity. Staff are strong on customer services they get to know you..etc Also loyalty cards that are swiped before each bet will need registering to get one.
If you cop over £5k it's unlikely they could pay out in readies...still possible. The way they try and do it is offer a cheque and then the triigger kicks off in your back account. This is down to their insurance liability and cash held in the branch at any time.
Best way for any amount is to arrange for a cash payment over £5k and use their open credit facility and get the cash from the bank cashier off premises from their bank. No ID required. It would take a phone call from the betting office staff, 2-3 hours to clear, and then its sorted. (you have to have a winning bet first of course)
Other ways is to shovel lumps of cash into the cash roulette machines, make a couple of no win/lose bets, cash out. Clean money from gambling winnings that aren't taxable.